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Old 06-23-2022, 12:40 AM   #1
2019 Sightseer 33C
Join Date: Jun 2022
Location: Yuma, AZ
Posts: 8
Front A/C inadequate for Yuma summers

I just bought this used 2019 Sightseer two weeks ago (with only 9,000 miles on it).

It gets over 100 a lot here in Yuma, AZ. The front A/C just doesn't seem adequate to keep the RV cool. Earlier today when the outside temp was 105, the inside got up to 95. But the bedroom stays cool at 81 (with the door closed). If I leave the bedroom door open with the A/C on, it cools down the hall where the front A/C thermometer is and fools the front A/C into thinking that it doesn't need to be on - and then it really heats up in the front.

When the front A/C is on (like now), a temperature probe at the vent is showing 80 (the room temp is 82, outside temp is 95). I've seen it as cold as 68 at the vent, but it doesn't seem to stay that cold for long. Why is that?

I am having MagneShades installed on all the front windows in a few weeks. I'm hoping that will help, but I'm still concerned that the air coming out of the A/C units never gets cold enough to really do any good. If I could keep the front at 80 like I can in the bedroom, I would be happy.
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Old 06-23-2022, 07:13 AM   #2
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Join Date: Sep 2009
Location: Spring Branch, TX
Posts: 5,650
It is just a fact of RV life that motorhomes are not well insulated and not made for temperature extremes. There is not much more extreme than Yuma, AZ in the summertime.

If you think your A/C is not blowing cold enough put an instant read thermometer in the air flow to see how cold the air is. It should be 20 - 25 degrees colder that the outside air temp.

The sun on your RV is the problem and you need to minimize afternoon sun. The front windows are huge heat generators so blocking them would help.

But really everything you do will only be a bandaid. The usual way to avoid this issue is to get in the driver’s seat and drive north in the summer… and then drive south in the winter.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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Old 06-23-2022, 07:48 AM   #3
Winnebago Camper
Join Date: Feb 2022
Location: Central PA
Posts: 15
you're probably already doing this, but the other point might be to open the vents on the unit itself vs. having them closed so the air goes through the ducts - if you have a ceiling mounted unit.
Made a significant difference on our travel trailer and assume it would be the same for a MH.
Then when the sun goes down and temps fall a bit - you can reverse the flow back through the vents.
Scott & Phyllis Brown and Ben
2022 Adventurer 36Z towing a 2022 Black Diamond Ford Bronco
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Old 06-23-2022, 11:59 AM   #4
Winnebago Owner
Join Date: Jun 2018
Location: On the road
Posts: 139
Pull both sun shades ,( black screens ) and night shades ( white screens ) ,on windows thru out coach . Get a box fan and currulate more air though coach . Position coach so front area is not in direct sun morning or sun set . Put awning out to shade coach .
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